https://bugs.kde.org/show_bug.cgi?id=504406
Bug ID: 504406
Summary: K-menu feels laggy because submenu highlight doesn't
follow mouse immediately
Classification: Plasma
Product: plasmashell
Version First 6.3.4
Reported In:
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Application Menu (Kicker) widget
Assignee: plasma-b...@kde.org
Reporter: aspotas...@gmail.com
Target Milestone: 1.0
Created attachment 181425
--> https://bugs.kde.org/attachment.cgi?id=181425&action=edit
screencast ru_RU
SUMMARY
K-menu feels laggy because submenu highlight doesn't follow mouse immediately.
There's a ~120ms delay.
STEPS TO REPRODUCE
1. Click on K-menu button to open menu
2. Jiggle mouse pointer up and down over the top-level menu to hover different
items.
OBSERVED RESULT
Upon hovering another top-level menu item, nothing happens for ~120ms (~7
frames for a 60 Hz display), and then 2 things happen around the same time:
1. the highlight moves to the item that was under mouse cursor ~120ms ago
2. the submenu opens for the highlighted item.
All in all, it visually behaves the same as using a remote desktop with a 120ms
RTT (e.g. transatlantic).
EXPECTED RESULT
The delay should be much lower, 16ms max. If loading a submenu takes more time
(e.g. due to I/O), at least the top-level menu item highlight should update
immediately (within 16ms) to make an impression for the user that the UI is
responsive.
SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 41
KDE Plasma Version: 6.3.4
KDE Frameworks Version: 6.13.0
Qt Version: 6.8.2
Kernel Version: 6.13.11-200.fc41.x86_64 (64-bit)
Graphics Platform: X11
Processors: 8 × Intel® Core™ i7-6700HQ CPU @ 2.60GHz
Memory: 15.4 ГиБ of RAM
Graphics Processor 1: Intel® HD Graphics 530
Graphics Processor 2: NVIDIA GeForce GTX 960M
ADDITIONAL INFORMATION
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